netdev - Re: [PATCH bpf-next v7 07/10] selftests/bpf: Add test for unstable CT lookup API

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Message-ID: <20220113223557.45d5czezncjwekge@ast-mbp.dhcp.thefacebook.com>
Date:   Thu, 13 Jan 2022 14:35:57 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     bpf@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH bpf-next v7 07/10] selftests/bpf: Add test for unstable
 CT lookup API

On Tue, Jan 11, 2022 at 11:34:25PM +0530, Kumar Kartikeya Dwivedi wrote:
> +
> +#define nf_ct_test(func, ctx)                                                  \
> +	({                                                                     \
> +		struct bpf_ct_opts opts_def = { .l4proto = IPPROTO_TCP,        \
> +						.netns_id = -1 };              \
> +		struct bpf_sock_tuple bpf_tuple;                               \
> +		struct nf_conn *ct;                                            \
> +		__builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4));       \
> +		ct = func(ctx, NULL, 0, &opts_def, sizeof(opts_def));          \

Have you tried converting the macro to static always_inline
and passing func as a pointer to a function?
The first argument 'ctx' is different, but if you prototype it
in this static inline as (*fn)(void *ctx)
and type case it later in nf_skb/xdp_ct_test() that should still work?